我正在尝试将以下tweet存储到longtext列/ utf8 charset / MySQL 5.5中。 MyISAM存储已打开的数据库。
我们还尝试了utf8mb4，utf16，utf32字符集，但无法解决此问题。
tweet="@Dorable_Dimples: Okay enough of those #IfYouWereMines I'm getting dep
ressed. #foreveralone ?" lol yes
mysql> ALTER DATABASE foo CHARACTER SET utf8 COLLATE utf8_bin;
mysql> show variables like 'char%';
+--------------------------+-------------------------------------------+
| Variable_name | Value |
+--------------------------+-------------------------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | latin1 |
| character_set_system | utf8 |
| character_sets_dir | /rdsdbbin/mysql-5.5.12.R1/share/charsets/ |
Incorrect string value: '\xF0\x9F\x98\x94\xE2\x80...' for column 'tweet' at row 1
Unable to store tweet "@Dorable_Dimples: Okay enough of those #IfYouWereM
ines I'm getting depressed. #foreveralone ?" lol yes
javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCExcept
ion: could not insert
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityMana
gerImpl.java:1387)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityMana
gerImpl.java:1315)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityMana
gerImpl.java:1321)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityMana
gerImpl.java:843)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(
SQLStateConverter.java:140)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.ja
va:128)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelpe
r.java:66)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(Abstra
ctReturningDelegate.java:64)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(Abstract
EntityPersister.java:2345)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(Abstract
EntityPersister.java:2852)
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentity
InsertAction.java:71)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplica
te(AbstractSaveEventListener.java:320)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(Abstract
SaveEventListener.java:203)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(
AbstractSaveEventListener.java:129)
at org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(E
JB3PersistEventListener.java:69)
at org.hibernate.event.def.DefaultPersistEventListener.entityIsTransient(
DefaultPersistEventListener.java:179)
at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultP
ersistEventListener.java:135)
at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultP
ersistEventListener.java:61)
at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:808)
at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:782)
at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:786)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityMana
gerImpl.java:837)
... 5 more
Caused by: java.sql.SQLException: Incorrect string value: '\xF0\x9F\x98\x94\xE2\x
80...' for column 'tweet' at row 1
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3609)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3541)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2002)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2624)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.jav
a:2127)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:
2427)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:
2345)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:
2330)
at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAnd
Extract(IdentityGenerator.java:94)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(Abstra
ctReturningDelegate.java:57)
最佳答案
导致问题的是推文结尾处的字符。
它看起来像是一个“表情符号”字符，又名日本笑脸，但在Chrome或Safari中都没有显示。
在某些版本的MySQL中，存储4字节utf字符存在一些已知问题。显然，您必须使用utf8mb4来表示4个字节的UTF字符，因为普通的utf8字符集只能表示最大3个字节的字符，因此不能存储Basic Multilingual Plane以外的字符
http://dev.mysql.com/doc/refman/5.5/en/charset-unicode-utf8mb4.html
这对我来说是个新闻，因为它基本上意味着MySQL中的utf8数据类型并不是真正正确的utf8。
有关如何处理此问题的建议
How to insert utf-8 mb4 character(emoji in ios5) in mysql?包括:
“还请确保您的应用程序层将其数据库连接的字符集设置为utf8mb4。请仔细检查是否确实在发生–如果您正在运行所选框架的mysql客户端库的旧版本，则可能未使用utf8mb4支持对其进行编译并且无法正确设置字符集。如果不正确，则可能必须对其进行更新或自己编译”
如果您使用的是Connector / J，则需要在连接配置中设置character_set_server = utf8mb4。
您所有的字符集都应为utf8mb4，您可能已经尝试过，但目前尚未设置。